I had to boil the end of the tubing for a good minute. To get the nipple started on the tubing I held the swivel nut with vice grips.

I was able to do it in shifts. I'd barely get the tail piece on (just enough to stay on the tubing. And then submerge the tail piece and tubing in the boiling water for about 20 seconds. Remove from the water and complete installation.

*** Be Careful** the tail piece heats up quick and will split the tubing if it gets too hot.

Of course, I also have some of the stainless (also threaded) QD's to allow me to fit more kegs in my current brew fridge. Once I get a keezer built, that could change.

BTW, nothing against the guy from Chi, but he's extremely slow to respond to emails, and getting him on the phone typically takes hours/days. Due to issues I had getting my first order from him (delayed over a week) I'm extremely reluctant to order again. Especially when I can email the guys at Keg Connection and have a response same day (business day). If I call up, I have someone on the phone quickly and have the info I wanted. IMO, customer service is just as important (or more so) than lower costs.

You don't want to go smaller than the ID of the tubing. If anything go the same size, or a hair larger. Such as I use 5/16" ID gas tubing, on 5/16" swivel nuts. But my beer line is 3/16" ID (better in many peoples opinions) so the nuts are 1/4". The nuts on the swivel nuts go to 1/4" MFL, which is standard issue on disconnects, manifolds, bulkheads, etc...

You don't want to go smaller than the ID of the tubing. If anything go the same size, or a hair larger. Such as I use 5/16" ID gas tubing, on 5/16" swivel nuts. But my beer line is 3/16" ID (better in many peoples opinions) so the nuts are 1/4". The nuts on the swivel nuts go to 1/4" MFL, which is standard issue on disconnects, manifolds, bulkheads, etc...

+1. I wasn't really suggesting using the 1/8" Barbs.. just noting they had them. I actually have some 1/8" line I use for resistance on soda lines. But I would take either the same ID barb as the line or a little bigger, otherwise you are asking for leaks.